python pandas:重命名数据帧中的序列？

Question

我正在使用python pandas进行数据分析，并且我想更改dataframe中序列的名称。

这是可行的，但似乎效率很低：

AA = pandas.DataFrame( A )
for series in A:
    AA[A_prefix+series] = A[series]
    del A[series]

有没有办法就地更改系列名称？

Answer 1

当然，您可以使用rename方法：

In [11]: df = DataFrame({"A": [1,2], "B": [3,4]})

In [12]: df.rename(columns={"A": "series formerly known as A"})
Out[12]: 
   series formerly known as A  B
0                           1  3
1                           2  4

但是，这不会改变df：

In [13]: df
Out[13]: 
   A  B
0  1  3
1  2  4

如果您想使用inplace，您可以获得该行为

In [14]: df.rename(columns={"A": "series formerly known as A"}, inplace=True)
Out[14]: 
   series formerly known as A  B
0                           1  3
1                           2  4

In [15]: df
Out[15]: 
   series formerly known as A  B
0                           1  3
1                           2  4